Hi folks, really dumb question as per the thread subject. My geyser is tripping the lights at random every twenty minutes or so. Do I need to call my plumber or an electrician?

Bonus points to anyone who might be able to hazard a guess as too what might be the issue that's causing the geyser to trip the lights.

Thanks so much for taking the time to read my (hopefully not too stupid) question.

- Frank